Back to WORK-ENERGY-POWER
JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
1 of 1
Analyzing
+4 | -1
Statement-1: A block of mass ' ' is placed on a moving railroad car moving with velocity ' '. The kinetic energy of the block is in all frames.
Statement-2: The kinetic energy of a system or body is different in different frames.
Statement-2: The kinetic energy of a system or body is different in different frames.
View answer and explanation
Correct option: D
Statement-1 is false, Statement- 2 is true.
Option D (Statement-1 is false, Statement- 2 is true) is correct because kinetic energy depends on the frame of reference.
More Questions from WORK-ENERGY-POWER
Practice All Chapter MCQs →
A ball throwing cannon, lifts ball and throws with Speed. If balls are raised upto . then find Input power of cannon if it lifts 8 balls per minute and its efficiency is . Mass of each ball is .
Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
Reason: Angular displacement is not an axial vector. A body of mass thrown vertically upwards attains a maximum height . As what height will its kinetic energy be of its initial value? Assertion: Centripetal force does no work.
Reason: Force and displacement are perpendicular to each other. Statement I: Both stretched and compressed springs possess potential energy.
Statement II: Work done against restoring force is stored as potential energy. A bullet of mass moving at a speed hits a ball of mass kept at rest. A small part having mass breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed in the direction of the bullet. Find the velocity of the bullet after the collision.
Reason: Angular displacement is not an axial vector. A body of mass thrown vertically upwards attains a maximum height . As what height will its kinetic energy be of its initial value? Assertion: Centripetal force does no work.
Reason: Force and displacement are perpendicular to each other. Statement I: Both stretched and compressed springs possess potential energy.
Statement II: Work done against restoring force is stored as potential energy. A bullet of mass moving at a speed hits a ball of mass kept at rest. A small part having mass breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed in the direction of the bullet. Find the velocity of the bullet after the collision.